Further removal of static admin validation that can fail erroneously

django/contrib/admin/validation.py

@@ -246,7 +246,6 @@ def validate_fields_spec(cls, model, opts, flds, label):
                 # readonly_fields will handle the validation of such
                 # things.
                 continue
-            check_formfield(cls, model, opts, label, field)
             try:
                 f = opts.get_field(field)
             except models.FieldDoesNotExist:
@@ -302,14 +301,6 @@ def validate_base(cls, model):
     # exclude
     if cls.exclude: # default value is None
         check_isseq(cls, 'exclude', cls.exclude)
-        for field in cls.exclude:
-            check_formfield(cls, model, opts, 'exclude', field)
-            try:
-                f = opts.get_field(field)
-            except models.FieldDoesNotExist:
-                # If we can't find a field on the model that matches,
-                # it could be an extra field on the form.
-                continue
         if len(cls.exclude) > len(set(cls.exclude)):
             raise ImproperlyConfigured('There are duplicate field(s) in %s.exclude' % cls.__name__)
 
@@ -380,14 +371,6 @@ def get_field(cls, model, opts, label, field):
         raise ImproperlyConfigured("'%s.%s' refers to field '%s' that is missing from model '%s.%s'."
                 % (cls.__name__, label, field, model._meta.app_label, model.__name__))
 
-def check_formfield(cls, model, opts, label, field):
-    if getattr(cls.form, 'base_fields', None):
-        try:
-            cls.form.base_fields[field]
-        except KeyError:
-            raise ImproperlyConfigured("'%s.%s' refers to field '%s' that "
-                "is missing from the form." % (cls.__name__, label, field))
-
 def fetch_attr(cls, model, opts, label, field):
     try:
         return opts.get_field(field)

tests/admin_validation/tests.py

@@ -269,8 +269,6 @@ class ValidationTestCase(TestCase):
         """
         class SongForm(forms.ModelForm):
             extra_data = forms.CharField()
-            class Meta:
-                model = Song
 
         class FieldsOnFormOnlyAdmin(admin.ModelAdmin):
             form = SongForm

tests/modeladmin/tests.py

@@ -682,27 +682,6 @@ class ValidationTests(unittest.TestCase):
 
         validate(BandAdmin, Band)
 
-        class AdminBandForm(forms.ModelForm):
-            class Meta:
-                model = Band
-
-        class BandAdmin(ModelAdmin):
-            form = AdminBandForm
-
-            fieldsets = (
-                ('Band', {
-                    'fields': ('non_existent_field',)
-                }),
-            )
-
-        six.assertRaisesRegex(self,
-            ImproperlyConfigured,
-            "'BandAdmin.fieldsets\[0]\[1\]\['fields'\]' refers to field 'non_existent_field' that is missing from the form.",
-            validate,
-            BandAdmin,
-            Band,
-        )
-
         class AdminBandForm(forms.ModelForm):
             delete = forms.BooleanField()